[dm-devel] logical volumes not being detected

[Eduard Nicodei]

On Monday 28 July 2008 18:57:22 Romanowski, John (OFT) wrote:
> Hi,
> I'm not familiar with ubuntu. In SLES one has to enable the boot.lvm script
> which runs vgscan and vgchange to detect and enable the PV's, VG's and
> their LV's.
>
> Try manually running vgscan and then vgchange -a y
> and see if that helps.
> good luck.
>
>
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> -----Original Message-----
>
> From: dm-devel-bounces at redhat.com on behalf of Eduard Nicodei
> Sent: Mon 7/28/2008 5:12 AM
> To: dm-devel at redhat.com
> Subject: [dm-devel] logical volumes not being detected
>
> Hello, this is my first posting here and I'm sorry if this has already been
> discused. All I want to know is what other modules/libraries other than the
> device-mapper kernel module, lvm2 and the devmapper library do I need in
> order to have my logical volumes detected.
> here's my setup: one 160GB sata2 hdd; one 320GB sata2 hdd; a minimal
> version of ubuntu (installed from debootstrap) and a custom compiled kernel
> version 2.6.26 (I should mention that the kernel doesn't contain all of the
> modules - I wanted it to provide only the features I need). I have created
> a physical volume, volume group and logical volume from another ubuntu
> installation. It is detected while using the live cd, and also if I boot
> the minimal ubuntu with another kernel that has a full set of features.
>
> regards, Eduard
>
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sorry, neither vgscan nor vgchange -a -y didn't work. However, after twinking 
my kernel I found the problem: I had to select the "Create deprecated sysfs 
files" and the "Kernel->user space relay support (formerly relayfs)" kernel 
configuration options, (both from "General setup");
now I'm not a dm-developer so this is just a suggestion: does device-mapper 
use deprecated sysfs files? If so, it should be upgraded, or at least a 
warning be posted somewhere that dm needs those files.